vdpa: ifcvf: free config irq in ifcvf_free_irq()

We don't free config irq in ifcvf_free_irq() which will trigger a
BUG() in pci core since we try to free the vectors that has an
action. Fixing this by recording the config irq in ifcvf_hw structure
and free it in ifcvf_free_irq().

Fixes: e7991f3 ("ifcvf: implement config interrupt in IFCVF")
Cc: Zhu Lingshan <lingshan.zhu@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200723091254.20617-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhu Lingshan <lingshan.zhu@intel.com>
Fixes: e7991f3 ("ifcvf: implement config interrupt in IFCVF")
Cc: Zhu Lingshan <a class="moz-txt-link-rfc2396E" href="mailto:lingshan.zhu@intel.com">&lt;lingshan.zhu@intel.com&gt;</a>
Signed-off-by: Jason Wang <a class="moz-txt-link-rfc2396E" href="mailto:jasowang@redhat.com">&lt;jasowang@redhat.com&gt;</a>

drivers/vdpa/ifcvf/ifcvf_base.h

@@ -84,7 +84,7 @@ struct ifcvf_hw {
 	void __iomem * const *base;
 	char config_msix_name[256];
 	struct vdpa_callback config_cb;
-
+	unsigned int config_irq;
 };
 
 struct ifcvf_adapter {

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -55,6 +55,7 @@ static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
 		vf->vring[i].irq = -EINVAL;
 	}
 
+	devm_free_irq(&pdev->dev, vf->config_irq, vf);
 	ifcvf_free_irq_vectors(pdev);
 }
 
@@ -74,8 +75,8 @@ static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
 	snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
 		 pci_name(pdev));
 	vector = 0;
-	irq = pci_irq_vector(pdev, vector);
-	ret = devm_request_irq(&pdev->dev, irq,
+	vf->config_irq = pci_irq_vector(pdev, vector);
+	ret = devm_request_irq(&pdev->dev, vf->config_irq,
 			       ifcvf_config_changed, 0,
 			       vf->config_msix_name, vf);
 	if (ret) {